<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container" @mouseleave="leaveShow" @mousemove="moveShow">
      <h2 class="all">全部商品分类</h2>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
      <div class="sort" v-show="show" >
        <div class="all-sort-list2" @click="goSearch">
          <div class="item" v-for="c1 in categoryList" :key="c1.categoryId">
            <h3>
              <a href="javascript:;" :data-categoryName="c1.categoryName" :data-category1id="c1.categoryId">{{c1.categoryName}}</a>
            </h3>
            <div class="item-list clearfix">
              <div class="subitem" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                <dl class="fore">
                  <dt>
                    <a href="javascript:;" :data-categoryName="c2.categoryName" :data-category2id="c2.categoryId">{{c2.categoryName}}</a>
                  </dt>
                  <dd>
                    <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                      <a href="javascript:;" :data-categoryName="c3.categoryName" :data-category3id="c3.categoryId">{{c3.categoryName}}</a>
                    </em>
                  </dd>
                </dl>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapState} from 'vuex'
export default {
    name: 'TypeNav',
    data(){
      return {
        show: true
      }
    },
    mounted(){
      if(this.$route.path != '/home'){
        this.show = false
      }
    },
    computed:{
      ...mapState({
        categoryList: state => state.home.categoryList
      })
    },
    methods:{
// 点击a标签才要进行路由跳转
// 最佳方案：给三个级的a他们的父元素，做事件委派即添加click事件，再进行编程式路由跳转
// 区分一级、二级、三级中的a，可加上自定义属性和属性值来准确的指定的获取
      goSearch(event){
        let element = event.target
// 节点有一个属性dataset，可以获取节点的自定义属性和属性值
        let {categoryname,category1id,category2id,category3id} = element.dataset
        // 如果标签上有categoryname，那一定是a标签
        if(categoryname){
          // 保存路由跳转的参数
          let location = {name:'search'}
          let query = {categoryName: categoryname}
          // 一级分类、二级分类、三级分类的a标签
          if(category1id){
            query.category1Id = category1id
          } else if (category2id){
            query.category2Id =  category2id 
          } else {
            query.category3Id = category3id
          }
              // 整理完整的参数
            location.query = query
            location.params = this.$route.params
            // 路由跳转
            this.$router.push(location)
        }
      },
      // 鼠标移入全部商品显示sort
      moveShow(){
          this.show = true
      },
      // 鼠标移出sort隐藏
      leaveShow(){
        if(this.$route.path != '/home'){
          this.show = false
        }
      }
    }
    
}
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;
  .item:hover{
    background-color: skyblue;
  }
  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>